Transformer tank



' 6 1927. Sept R. v. BINGAY TRANSFORMER TANK Filed Jan. 15, 1925 m /2 j u mnlllllIllllNUlllxnnh .Hmm m L. m l mw 7W m r m i anun/tez Umweg/4 v sudden cooling.v

Patented Sept. e, 1927.

UNITED sTATEs PATENT OFFICE.

ROBERT V. PINGAY, 0E PITTSBURGH, PENNSYLVANIA, AssIGNoR To PITTSBURGH TRANsEoRMER COMPANY, A ooRPoRATIoNoE PENNSYLVANIA.

TRANSFORMER TANK.

Application med January 15, 1923. serial No. 612,604.

This invention relates to` tanks for trau-sformers and similar apparatus adapted to be submerged in cooling and insulating oil, and particularly to the part of the container covering the surface of the oil in such tanks. Hitherto it has been the practice to leave these parts over the surface of the oil exposed on the outside to the air for additional cooling effect.A This, however, in many cases and particularly in transformers installed outdoors results in a condensation of moisture within the top of the main tank or expansion tank over the surface of the oil whenever there is sudden cooling. This condensed moisture may eventually find itsy rway into the oil with impairment of the insulating strength of the oil.

The object of this invention is to avoId Vthis objectionable condensation of moisture by protecting the tank parts over the oil from In the accompanying drawings Fig. 1 is a vertical sectional view of a transformer having its top covered with heat insulating material in accordance with this invention, and

Figs. 2`and 3 are sectional views of a modification illustrating the application of the heat insulating material to a separate expansion tank, the main tank being filled `with oil without an upper exposed surface.

In the specific embodiment of the invention shown in Figure 1 a transformer tank 4 having atop ring flange 5 is provided with a cover 6 having a manhole 7 withan independently removable top 8. openings through the cover are provided for the leads and frame rods as indicated at 9-9 and the cover 6 is held to he flange 5 by clamps 10. The transformer indicated by dotted lines at 20 resting on the bottom of the tank is immersed in oil which fills the tank to the lever 11 and when the transformer is in service this oil becomes heated and the air space 12 above it also becomesy Various rial are provided over the exposed surfaces of the cover 6 and top4 8 as shown. These' lation maybe provided in any desired man ner such for instance layers of fabric.

In the modification shown 'in Figs. 2 and 3 the main tank T is filled with oil up to its as by air pockets or very top andthe oil overflows or expands into the expansion tank t connected to the main tank T by the pipe 15. This expansion tank thas a'. liquid level gauge 16 and a breather 17 maintaining communications between the outside air and the surface of the oil in the expansion tank. All of the surfaces of the expansion tank t that are or are likely to be in contact with the space over the surface of the oil are covered with heat insulating material or laggingv 19 so that ,this space above the oil in the expansion tank is kept protected against sudden cooling.

While the invention has been described in connection with specific embodiments it is not confined thereto but is intended to cover such modifications thereof as fall within the scope of the appended claim.

` I claim l In combination a transformer tank containing oil and a transformer or similar in termittent heat radiating apparatus therein and having uncovered vertical side surfaces adapted to cool said oil to prevent undue rise in temperature, an air space being pro vided above the ysurface of said oil in said tank, a cover having a metal under surface covering said air space, and heat insulating material on the surface of said cover to avoid premature chilling of the top surface of said air space and prevent condensation of moisturel on said surface during cooling of said transformer. f

ROBERT V. BINGAY. 

